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參數(shù)資料
| 型號(hào)： | TQ5135 |
| 英文描述： | Analog IC |
| 中文描述： | 模擬IC |
| 文件頁數(shù)： | 13/22頁 |
| 文件大?。?/td> | 261K |
| 代理商： | TQ5135 |
TQ5135
Data Sheet
For additional information and latest specifications, see our website:
www.triquint.com
13
SUGGESTED STEPS FOR TQ5135 TUNING:
The following order of steps is recommended for applying the
TQ5135. They are described in detail in the following
sections:
Lay out board consistent with the grounding guidelines at the
beginning of this note. See section 1 regarding LNA source
inductor.
1.
Determne the LNA bias resistor value and source inductor
value
2. Determne the LNA input matching network component
values. Test the LNA by itself.
3. For the mxer, experimentally determne proper LO tuning
components. This step needs to be done first since all of
the later tuning is affected by it.
4. Determne a tentative GIC network. It will have to be fine-
tuned later, since the image filter interaction will affect
device current.
5. Synthesize a tentative IF output match. It may have to be
fine-tuned later, as the final GIC configuration affects IF
stage current. LO is turned ON.
6. Experimentally determne a tentative mxer RF Input match.
LO is turned ON. Test the filter-mxer cascade. Verify that
the device has adequate IP3. If not, another RF Input
matching topology can be tried.
7. Fine tune GIC components for needed Idd. LO is turned
ON.
8. Check IF match to see if it still is adequate. LO is turned
ON.
9. Test the device as a whole- LNA, filter, mxer
1. Determine LNA Bias Resistor Value and Source
Inductor Value
For most designs we recommend an LNA bias resistor of 2.7K
ohms. All of the datasheet specs assume that value of
resistor. However, if LNA Idd <15mA is desired, then the
resistor can be made larger. Refer to Figure 12 for graphs of
LNA performance vs. bias resistor.
Please keep in mnd that there are implications of reduced
LNA bias that are not reflected in IP3. For
example, the LNA
is normally in front of the image filter so that it may need
resistance to blocking or other types of distortion that are not
adequately described by the IP3 figure of merit.
Figure 12: Gain, IIP3, Idd, and NF as a Function of Rbias
5135 LNA
NF, Gain, IIP3 and Idd vs bias resistor
0
2
4
6
8
10
12
14
16
18
1.1
1.5
2.2
2.7
3.3
4.7
6.8
8.2
10
Bas resistor (kOhms
)
dB
5.00
7.00
9.00
11.00
13.00
15.00
17.00
19.00
21.00
23.00
Idd (mA
NF
Gan
IIP3
Idd
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